Bubba..I was reading this in the How-To section and came across this section..when he says to MANUALLY move the servo arm, he means actually taking the arm off the servo and aligining it at the 90 deg mark ? I was under the impression that this is not always possible ?

Geometry Step Three:

In order to get the symmetry perfect, the linkages must be identical in length, alignment and travel. This takes a few tricks but is easily accomplished with a paper protractor and a good eye. To correctly set up the linkage the servo must be installed in the airplane and a protractor mounted to the airframe in such a manner as to allow the servo arm center to be in line with the center of the protractor. Ideally, the center point of the protractor will be the center line of the servo arm pivot point (see figure 5).

Simply cut out the protractor and align its center where the servo arm pivot point is and use tape to hold it in place. Do this on both servos. The orientation of the servo is unimportant, the only thing that needs to happen here is that the protractor 90* mark needs to be perpendicular to the control direction (nose-tail in this example) Once the protractors are installed, the servo arm is moved manually to the 90 degree mark (see figure 5).

Note : it is unimportant at this time whether the servo is centered so do not use the radio to perform this step - move the servo arm manually and don't worry about electrical center.